Hi,
>I have an application with which I can view a TIFF image in RGB space.
> I want to be able to view TIFF images in CIELAB color space.
> How can I use the lcms library to achieve that?
Is quite easy.
//----------------------------------
#include "lcms.h"
int main(void)
{
cmsHPROFILE hInProfile, hOutProfile;
cmsHTRANSFORM hTransform;
int i;
hInProfile = cmsOpenProfileFromFile("lcmstiff8.icm", "r");
hOutProfile = cmsCreate_sRGBProfile(void);
hTransform = cmsCreateTransform(hInProfile,
TYPE_Lab_8,
hOutProfile,
TYPE_BGR_8,
INTENT_PERCEPTUAL, 0);
for (i=0; i < AllScanlinesTilesOrWatseverBlocksYouUse; i++)
{
cmsDoTransform(hTransform, YourInputBuffer,
YourOutputBuffer,
YourBuffersSizeInPixels);
}
cmsDeleteTransform(hTransform);
cmsCloseProfile(hInProfile);
cmsCloseProfile(hOutProfile);
return 0;
}
//----------------------------------
There are two flavors of TIFF Lab, the 8-bits encoding and 16-bits encoding.
Both are encoded in a mutual incompatible way, so you would need to use two
different profiles.
Use lcmstiff8.icm (http://www.littlecms.com/tiff8adobe.zip) for 8-bit
encoding, or you can use the built-in Lab profile for 16 bits. That is,
replace whole line by
hInProfile = cmsCreateLabProfile(NULL)
Of course, you can also use a monitor/printer output profile instead
of sRGB, in such case you will get full color management as a tip.
Hope this helps,
Mart� Maria
The little cms project
http://www.littlecms.com
[EMAIL PROTECTED]
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